#include <iostream>
#include <algorithm>
using namespace std;

int main(){

    int a ,b ,c;
    cin >> a >> b >> c;
    int ans = 1e9;

    for (int i = 0; i <= a; i++){
        for (int j = 0; j <= b; j++){
            
            if (i + j == 0) continue;
            int now = i + j*10;
            int rest = a - i + b -j;
            for (int k = 0; k < now; k++)
            {
                int back = rest + k / 10 + k % 10;
                if (back == c) ans = min(ans,now - k);                  
            }
        }
    }
    if (ans < 1e9) cout << ans << endl;
    else cout << "Impossible" << endl;

}